Abstract
The taxonomic description of Streptomyces spadicogriseus, a new species belonging to the Gray Series of streptomycetes as classified by PRIDHAM and TRESNER, is presented. This new species is distinguishable from the known members of the Gray Series. Streptomyces spadicogriseus produces anthramycin but bears no taxonomic relation to the known producer of the antibiotic: S. refuineus var. thermotolerans.
